Applicable Systems
DVP
AH500
AS300
C2000
MS300
Symptoms
The drive trips. The keypad displays E09, indicating drive overload. The drive's internal thermal protection has detected that the drive itself is overloaded.
Possible Causes
- Drive operating in overload region for too long
- Drive ambient temperature too high
- Drive cooling fan failed or airflow blocked
- Drive duty rating too low for the application
Troubleshooting Steps
- Step 1: Check drive ambient temperature and enclosure ventilation
Ambient is within rated range and ventilation is adequate - Step 2: Verify drive cooling fan is operational
Fan is running and airflow is unobstructed - Step 3: Verify drive is not continuously above rated current
Drive current is within continuous rating - Step 4: If load is too high, increase drive capacity
Drive operates within rated limits
How to Reset
To reset: 1) Reduce drive load or improve cooling. 2) Allow drive to cool. 3) Press RESET. Caution: Repeated drive overload trips damage power semiconductors permanently.
Frequently Asked Questions
- Q: What is the overload capacity of Delta MS300?
The MS300 has 150% overload for 60 seconds in heavy duty mode. The exact capacity depends on the duty class parameter setting and the drive frame size. Check the manual for specific model ratings.
- Q: What is the difference between normal duty and heavy duty?
Normal duty (variable torque) is for fans and pumps with lower torque requirements. Heavy duty (constant torque) is for conveyors and other high-torque applications. The drive's overload capacity differs between the two modes.
Source: Delta MS300 Series User Manual, 2023
Category: PLC & VFD